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When to plant oregano in Zone 3b
In Zone 3b, start indoors around March 18 – April 1 and transplant around May 20 – June 3.
Your oregano timeline — Zone 3b
| Start indoors | March 18 – April 1 |
|---|---|
| Transplant | May 20 – June 3 |
| Zone 3b last frost | ~05/20 |
| Zone 3b first frost | ~09/19 |
Start indoors; set out 1 week after the last frost. [src]Cited: Johnny's Selected Seeds — Seed-Starting Date Calculator chart
Dates computed from Zone 3b's median NOAA frost normals and the cited rule. Your town may differ by a week or two — check your exact ZIP.
What you'll need
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Last verified 2026-07-17. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: Johnny's Selected Seeds — Seed-Starting Date Calculator chart.